Taking a new injection type hybrid active power filter as an example, this paper proposes a new technology for eliminating switching ripples with adopting the synthesis control algorithm for current tracking, attaching the SVPWM based on random PWM and installing the output filter desig.

This paper describes the function on output filter in parallel inverters,the problems have been analyzed in the traditional filters.

This paper describes the function on output filter in inverter to reduce the produced output harmonics,the transient oscillations on the traditional LC filter has been analyzed.

A design of active power filter based on selective harmonic elimination technique;

Study of injection-type hybrid active power filter;

Parameter design and engineering application of injection-type hybrid active power filter;

An improvement scheme for the parallel hybrid active power filter(APF) is presented: a resonance branch was paralleled to the original parallel hybrid APF,which greatly reduced the total capacity of the APF without damaging its filtering performance.

In the control strategies for an active power filter(APF),the determination of harmonic and reactive components of the load current is the most important stage.

Based on the analysis of the harmonic sources and the methods of compensation,a new filtering measure,active power filter(APF) is presented,including its working principle and internal structure.

Two phase Control Method for Active Filters Fit for asymmetrical Systems;

Optimization design of active filters based on adaptive parallel genetic programming;

The present status for HVDC converter station is presented,and its future development trends are discussed in several aspects such as power electronic components,active filters,optical direct current transducer,control and protection system,mode of connection,etc.